I am trying to replace a period with a colon within a time stamp but without effecting other periods in in the text. <trkpt lat="31.579166667" lon="120.295263333"> <ele>24.533331553</ele> <time>2007-05-05T11:20:57.927Z</time> </trkpt> In the <time> row I need to change the last . to : this has alway...